Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a59187816eabe82…

MALICIOUS

PDF

85.5 KB Created: 2021-08-25 15:45:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: caebf2793bf29ee3c5a1fd4ee894c610 SHA-1: 1e6b90858d28f10d78b63ee6796ce95ec497122f SHA-256: 5a59187816eabe8268cf2dab7d385ac38668621b08f573188191d60de87b0983
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also features a link farm pointing to multiple distinct hosts, many of which are hosted on compromised CMS upload storage or disposable hosting. These links likely serve as redirects to phishing pages or malware download sites. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://palcev.ru/userfiles/file/79302961140.pdf In PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885588e059f---15672188228.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/jasozifuwagigewizipaluxe.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/kotigasova.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/cabd0495e6ed5b823645177df505f339/situtezoz.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/q00nsc7n1nk33tk62d8quo2lc0/59646580971.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/c5761efe0fbe971891e34259511207d6/39462980861.pdfIn PDF document text
    • https://tonymusic.se/UserFiles/files/mutim.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160fb0e9ef26bf---nidegadiv.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/86460956831.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/69688058324.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1611f257ede1e4---46830921702.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/34591834031.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/muwedin.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/19619245484.pdfIn PDF document text
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/xipixobanolunosekem.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/37094285533.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/80233625061.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1284798f238892564025d145b021609e/962590505.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/71546651690.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfbbc3c54---vawazomelelune.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/totosafekelojer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=all+the+cheats+for+sims+4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 10556 bytes
SHA-256: b01514d6d3876c311452e81fec6e71b85d480074aff2eef202e3458e14dc226f
font_01_sfnt_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CB 17244 bytes
SHA-256: c4e90054554eaa234d17c5342870b54b2cc41eabd7e535dcf3ea09ae93ebfc64

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